CHPC Transfer switch closed transition
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1 Specification sheet CHPC Transfer switch closed transition Amp Description The Cummins series CHPC PowerCommand automatic transfer switch monitors the primary power source, signals the generator to start upon loss or destabilization of utility power, and then automatically transfers the load to the generator. Once the utility power source becomes available and stable, the CHPC will return the load to the primary source without power interruption by temporarily paralleling both sources for less than 100 msecs. Designed and constructed specifically for closed transition operation, this clean sheet, revolutionary design incorporates the innovative High Endurance Mechanism (HEM) for uncompromising reliability with the proven PowerCommand Microprocessor Control. Features UL-listed 30-cycle ratings - CHPC is listed for shorttime ratings of 25,000 amps at 10 cycles for amps, 30,000 amps at 30 cycles for amps, and 42,000 amps at 30 cycles for 800 amps. PowerCommand control - A standard, fully featured microprocessor-based control. Software-enabled features, settings, and adjustments are available for ease of setup and accuracy. Optically isolated logic inputs and high isolation transformers for AC power inputs provide high-voltage surge protection. Manual operation - Manual operating handles and stored energy transfer mechanism allow effective, manual operation of the CHPC. An external operator is available as an option for dead front manual operation. Manual operation of the CHPC can only be performed in the open transition transfer mode. Main contacts - Heavy-duty silver allow contacts and multi-leaf arc chutes are rated for total system transfer. Easy service/access - Plug connections, doormounted controls, ample access space, and compatible terminal markings allow for easy service. Product lines, accessories and services - Cummins offers a wide range of accessories and services to suit your requirements Warranty and service - Backed by a comprehensive warranty and worldwide distributor network.
2 Transfer switch mechanism CHPC has earned the industry s highest UL-listed short-time ratings. At 480 volts, amp switches are rated at 25,000 for 10 cycles, are rated at 30,000 for 30 cycles, and 800 is rated at 42,000 for 30 cycles. Blow-on contactor allows for high survivability in fault current conditions. Simultaneous make-before-break contactor action is used for 2-pole, 3- pole, and 4-pole switches. On 4-pole/switched neutral switches, this action also prevents the objectionable ground currents and nuisance ground fault tripping that can result from overlapping neutral designs. The CHPC will operate as an open transition transfer switch when transferring a load from a dead source to a live source. A mechanical interlock eliminates the possibility of source-to-source connection when the switch is manually operated. When operated in closed transition mode the mechanical interlock is disabled by the controller. This allows the CHPC to connect both sources together for a period not to exceed 100 msecs, providing a seamless transfer of the load between two live sources. Long-life, high pressure, silver alloy contacts resist burning and pitting. Separate arcing surfaces further protect the main contacts. Contacts are mechanically held in both normal and emergency positions for reliable, quiet operation. Superior arc interruption is accomplished through multiple leaf arc chutes that cool and quench the arcs. Barriers separate the phases and prevent inter-phase flashover. Specifications Voltage rating Amperage rating Frequency rating Neutral bar Auxiliary contacts Operating temperature Storage temperature Humidity Altitude Surge withstand ratings Total transfer time (source to-source) Transfer switches up to 600 VAC. Transfer switches are rated from 125 to 800 amperes. Transfer switches are rated to operate at 50 or 60 Hertz. A full current-rated neutral bar with lugs is standard on enclosed 2 and 3-pole transfer switches. Two switch position contacts rated at 10A Continuous and 250 VAC maximum (one for each source) are provided for customer use. -40 F (-40 C) to 140 F (60 C) -40 F (-40 C) to 140 F (60 C) Up to 95% relative, non-condensing Up to 10,000 ft (3,000 m) without de-rating Control system surge-tested for location category B3, per IEEE C62.41 and IEEE C Also meets European standard EN Will not exceed 6 cycles at 60 Hz when operated as an in phase monitor based open transition transfer switch
3 HEM power cassette Cassette design ensures that all phases and neutral are switched at the same speed, providing true four pole operation. Encapsulated contactor design increases phase to phase isolation and reduces possibility of arcing between phases. New design eliminates a common failure point in many transfer switches by not using electrical connections made of braided metal in the mechanism s current path. Simple design has fewer parts reducing the mechanism s potential for failure. The innovative design of the High Endurance Mechanism The High Endurance Mechanism (HEM) is designed to ride through a fault condition undamaged, retaining its capability to carry 100% of its rated load. Magnetic forces developed during a fault cause a conventional transfer switch s contacts to blow open, producing destructive arcing that often results in extensive internal damage to the switch. Typically after a conventional switch experiences a fault, its contacts, arc chutes and in some cases its controller needs to be replaced. The HEM uses that same magnetic energy to hold the contacts closed during a fault, practically eliminating arcing, contact damage, and performance degradation. That means the HEM does not require contact maintenance to continue to carry rated current without overheating. The HEM can survive multiple faults of the magnitude listed on the nameplate as the Withstand and Closing Current Ratings (WCR). This novel blow-on technology means that there will be no costly repairs or inconvenient downtime after a fault.
4 PowerCommand microprocessor control PowerCommand controls are microprocessor based and developed specifically for automatic transfer switch operation. The control provides features and options useful for most applications. Flash memory is used to store control settings. The contents of the memory are not lost even if power to the controller is lost. There is also an on-board battery to maintain the real-time clock setting and the engine start time delay. Control features include: Level 2 control Open transition (in-phase transition) Delayed transition (programmed transition) Closed transition (momentary overlap) Utility-to-genset applications Software adjustable time delays: Engine start: 0 to 120 sec Transfer normal to emergency: 0 to 120 sec Retransfer emergency to normal: 0 to 30 min Engine stop: 0 to 30 min Programmed transition: 0 to 60 sec Undervoltage sensing - 3-phase normal, 3-phase emergency Pickup: 85% to 98% of nominal voltage Dropout: 75% to 98% of pickup setting Dropout time delay: 0.1 to 1.0 sec Overvoltage sensing - 3-phase normal, 3-phase emergency Dropout: 105% to 135% of nominal voltage Pickup: 95% to 99% of dropout setting Dropout time delay: 0.5 to 120 sec Over/under frequency sensing Pickup: ±5% to ±20% of nominal frequency Dropout: ±1% beyond pickup Dropout time delay: 0.1 to 15.0 sec Voltage imbalance sensing Dropout: 2% to 10% Pickup: 90% of dropout Time delay: 2.0 to 20.0 sec Phase rotation sensing Time delay: 100 msec Loss of single phase detection Time delay: 100 msec Programmable genset exerciser - Eight events/schedules with or w/o load Basic indicator panel Source available/connected LED indicators Test/exercise/bypass buttons Digital display - standard Analog bargraph metering - optional Date/time-stamped event recording - 50 events Load sequencing (optional with Network Communications Module)
5 Time-delay functions Engine start: Prevents nuisance genset starts in the event of momentary power system variation or loss. Not included in utility-to-utility systems. Transfer normal to emergency: Allows genset to stabilize before application of load. Prevents power interruption if normal source variation or loss is momentary. Allows staggered transfer of loads in multiple transfer switch systems Retransfer emergency to normal: Allows the utility to stabilize before retransfer of load. Prevents needless power interruption if return of normal source is momentary. Allows staggered transfer of loads in multiple transfer switch systems Engine stop: Maintains availability of the genset for immediate reconnection in the event that the normal source fails shortly after retransfer. Allows gradual genset cool down by running unloaded. Not included in utility-to-utility systems. Delayed (programmed) transition: Transfers load to neutral position, disconnected from sources, to allow inductive load voltages to decay. Fail to disconnect timer: Signals external device to disconnect either the genset or utility to prevent extended operation in parallel with the utility. User interfaces Basic interface panel LED indicators provide at-a-glance source and transfer switch status for quick summary of system conditions. Test and Override buttons allow delays to be bypassed for rapid system checkout. Digital display (M018) The digital display provides a convenient method for monitoring load power conditions, adjusting transfer switch parameters, monitoring PowerCommand Network status, or reviewing transfer switch events. Password protection limits access to adjustments to authorized personnel. The digital display comes standard with the Level 2 PowerCommand microprocessor control, and is optional with the Level 1 Control. User interface options Front panel security key (M017) Front panel access can be locked out using this option. Prevents unauthorized transfers or testing. Prevents unauthorized adjustments via the digital display. Analog bar graph meter (D009) An LED bar graph display provides easy to read indication for Normal and Emergency voltages and frequencies, load currents, power factor, and kilowatts. Green, amber, and red LED's provide at-a-glance indication of system acceptability. Available as an option with the Level 2 PowerCommand microprocessor control. External operation handle (N038) Dead-front manual operating handle for safe manual operation. Can be operated while the switch is energized. Manual operation of the CHPC can only be performed in the open transition transfer mode. Manual operation of the OHPC can only be performed in the open transition transfer mode Control options Relay signal module (M023) Provides an adjustable transfer pre-signal time delay of 0 to 60 seconds to prevent interruption of power during elevator operation. Relay outputs include: Source 1 Connected and Available, Source 2 Connected and Available, Not in Auto, Test/Exercise Active, Failed to Disconnect, Failed to Synchronize, Failed to Transfer/Retransfer, and Transfer presignal (elevator signal). Loadshed (M007) Removes the load from the emergency power source by driving the transfer switch to the neutral position when signaled remotely. Transfers load back to the emergency source when the signal contacts open. Immediate retransfer to the preferred source when it is re-established. PowerCommand network interface (M031) Provides connection to the PowerCommand network. LonWorks compatible for integration into customer monitoring strategy. Load power and load current monitoring (M022) Measures load phase and neutral, current, power factor, real power (kw) and apparent power (kva). Warns of excessive neutral current resulting from unbalanced or nonlinear loads. Minimum detectable current level is 3%. * Note: Some options may not be available on all models - consult factory for availability.
6 UL withstand and closing ratings The transfer switches listed below must be protected by circuit breakers or fuses. Referenced drawings include detailed listings of specific breakers or fuse types that must be used with the respective transfer switches. Consult with your distributor/dealer to obtain the necessary drawings. Withstand and Closing Ratings (WCR) are stated in symmetrical RMS amperes. UL-listed specific breaker ratings Transfer switch ampere MCCB protection volts max with specific manufacturers MCCBs Max MCCB ratings Drawing reference Current limited breaker protection With specific current limiting breakers (CLB) 125, 150,225, A A048E , 400, A A048E A A048E Max CLB rating Drawing reference 500 A A048J A A048J A A048J560 UL-listed fuse protection ratings Transfer switch ampere 125,150, 225, 260 volts max. with current limiting fuses Max fuse, size and type Drawing reference A class J, T 200 A class RK1 100 A class RK5 A048E , 400, A class, L, T A048E A class, J, RK1, RK A class L A048E A class T UL-listed 3 cycle and short-time ratings Transfer switch ampere 125, 150, 225, , 400, volts max 3 cycle rating Short-time 480 volts Max MCCB rating Drawing reference ,000 for 10 cycles 500 A A048E ,000 for 30 cycles 1200 A A048E ,000 for 30 cycles 1400 A A048E
7 Enclosures The wall-mounted transfer switch and control are mounted in a key-locking enclosure. Wire bend space complies with 2005 NEC. Dimensions - transfer switch in UL type 1 enclosure Amp rating 125, 150, 225, , 400, 600 Height Width Depth Door closed Door open Weight 3-pole type in mm in mm in mm in mm lb kg Outline drawing Dimensions - transfer switch in UL type 3R, 4, 4x, or 12 enclosure Amp rating 125, 150, 225, , 400, 600 Height Width Depth Door closed Door open Weight in mm in mm in mm in mm lb kg Cabinet type Outline drawing R, 4, 4x, R, 4, 4x, R, 4, 4x, Transfer switch lug capacities All lugs accept copper or aluminum wire unless indicated otherwise. Adapters that will accept compression lugs are available for 5/16, 3/8, 1/2 and 5/8 mounting hardware. Compression lugs are not furnished. Lugs are listed in the Installation Manual. Amp rating Cables per phase Size 125, #10 AWG-3/0 2 #10 AWG-1/0 225, #6 AWG MCM 2 #6 AWG - 4/0 300, /0-750 MCM 1 #6 AWG MCM #4 AWG MCM #2 AWG MCM
8 Submittal detail: options Amperage ratings: Voltage ratings: R R R R R R R R R R Pole configuration: A065 Poles - 2 (solid neutral) A028 Poles - 3 (solid neutral) A029 Poles - 4 (switched neutral) Frequency: A Hertz A Hertz Application: A035 Utility to genset A037 Genset to genset System Options: A041 Single phase, 2-wire or 3-wire A042 Three phase, 3-wire or 4-wire Enclosure: B001 Type 1: general purpose indoor (similar to IEC type IP30) B002 Type 3R: intended for outdoor use (dustproof and rainproof) (similar to IEC type IP34) B003 Type 4: indoor or outdoor use (watertight) (similar to IEC type IP65) B004 Open construction: no enclosure - includes automatic transfer switch and controls. B010 Type 12: indoor use, dust-tight and drip-tight (similar to IEC type IP61) B025 Type 4x: stainless steel enclosure Standards: A046 UL 1008/CSA certification A064 NFPA 20 compliant A080 Seismic certification Controls C024 Switch control - Level 2 Control options M017 Security key - front panel M018 Display - digital M031 Communications - LonWorks network communications module M022 Load monitoring (min current level 3%) M023 Module - relay signal Meters D009 Digital bar graph meters Battery chargers K001 2 Amps, 12/24 Volts KB59 15 Amps, 12 Volts KB60 12 Amps, 24 Volts Auxiliary relays Relays are UL Listed and factory installed. All relays provide (2) normally open and (2) normally closed isolated contacts rated 600 VAC. Relay terminals accept (1) 18 Ga.to (2) 12 Ga. wires per terminal. L VDC coil - installed, not wired (for customer use). L VDC coil - emergency position - relay energized when ATS in source 2 (emergency) position. L VDC coil - normal position - relay energized when ATS in source 1 (normal) position L VDC coil installed, not wired L VDC coil - emergency position - relay energized when ATS in source 2 (emergency) position L VDC coil - normal position - relay energized when ATS in source 1 (normal) position Miscellaneous options M033 Terminal block - 30 points (not wired) M007 Load shed - from emergency - drives switch to neutral position when remote signal contact closes N038 Manual external operating handle Optional lug kits N008 Terminal lugs - cable N030 Lug adapters - compression (5/16 Stud) N031 Lug adapters - compression (3/8 Stud) N032 Lug adapters - compression (1/2 Stud) N043 Lug adapters - compressions (5/8 Stud) Warranty G002 One yr basic G004 Two yr comprehensive G006 Five yr basic G007 Five yr comprehensive G008 Ten year major components
9 Certifications All switches are UL 1008 listed and labelled with UL Type Rated cabinets and UL Listed CU-AL terminals. All switches are certified to CSA 282 Emergency Electrical Power Supply for Buildings, up to 600 VAC. All switches comply with IEEE Recommended Practice for Emergency and Standby Power Systems. This transfer switch is designed and manufactured in facilities certified to ISO9001. All switches comply with NFPA 70, 99 and 110. All switches comply with NEMA ICS 10. For more information contact your local Cummins distributor or visit 2017 Cummins Inc. All rights reserved. Cummins is a registered trademark of Cummins Inc. PowerCommand, AmpSentry, InPower and Our energy working for you. are trademarks of Cummins Inc. Other company, product, or service names may be trademarks or service marks of others. Specifications are subject to change without notice. S-1437 (10/17)
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